1 /* 2 cx231xx_vbi.c - driver for Conexant Cx23100/101/102 USB video capture devices 3 4 Copyright (C) 2008 <srinivasa.deevi at conexant dot com> 5 Based on cx88 driver 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 2 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program; if not, write to the Free Software 19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 20 */ 21 22 #include <linux/init.h> 23 #include <linux/list.h> 24 #include <linux/module.h> 25 #include <linux/kernel.h> 26 #include <linux/bitmap.h> 27 #include <linux/usb.h> 28 #include <linux/i2c.h> 29 #include <linux/mm.h> 30 #include <linux/mutex.h> 31 #include <linux/slab.h> 32 33 #include <media/v4l2-common.h> 34 #include <media/v4l2-ioctl.h> 35 #include <media/v4l2-chip-ident.h> 36 #include <media/msp3400.h> 37 #include <media/tuner.h> 38 39 #include "cx231xx.h" 40 #include "cx231xx-vbi.h" 41 42 static inline void print_err_status(struct cx231xx *dev, int packet, int status) 43 { 44 char *errmsg = "Unknown"; 45 46 switch (status) { 47 case -ENOENT: 48 errmsg = "unlinked synchronuously"; 49 break; 50 case -ECONNRESET: 51 errmsg = "unlinked asynchronuously"; 52 break; 53 case -ENOSR: 54 errmsg = "Buffer error (overrun)"; 55 break; 56 case -EPIPE: 57 errmsg = "Stalled (device not responding)"; 58 break; 59 case -EOVERFLOW: 60 errmsg = "Babble (bad cable?)"; 61 break; 62 case -EPROTO: 63 errmsg = "Bit-stuff error (bad cable?)"; 64 break; 65 case -EILSEQ: 66 errmsg = "CRC/Timeout (could be anything)"; 67 break; 68 case -ETIME: 69 errmsg = "Device does not respond"; 70 break; 71 } 72 if (packet < 0) { 73 cx231xx_err(DRIVER_NAME "URB status %d [%s].\n", status, 74 errmsg); 75 } else { 76 cx231xx_err(DRIVER_NAME "URB packet %d, status %d [%s].\n", 77 packet, status, errmsg); 78 } 79 } 80 81 /* 82 * Controls the isoc copy of each urb packet 83 */ 84 static inline int cx231xx_isoc_vbi_copy(struct cx231xx *dev, struct urb *urb) 85 { 86 struct cx231xx_dmaqueue *dma_q = urb->context; 87 int rc = 1; 88 unsigned char *p_buffer; 89 u32 bytes_parsed = 0, buffer_size = 0; 90 u8 sav_eav = 0; 91 92 if (!dev) 93 return 0; 94 95 if (dev->state & DEV_DISCONNECTED) 96 return 0; 97 98 if (urb->status < 0) { 99 print_err_status(dev, -1, urb->status); 100 if (urb->status == -ENOENT) 101 return 0; 102 } 103 104 /* get buffer pointer and length */ 105 p_buffer = urb->transfer_buffer; 106 buffer_size = urb->actual_length; 107 108 if (buffer_size > 0) { 109 bytes_parsed = 0; 110 111 if (dma_q->is_partial_line) { 112 /* Handle the case where we were working on a partial 113 line */ 114 sav_eav = dma_q->last_sav; 115 } else { 116 /* Check for a SAV/EAV overlapping the 117 buffer boundary */ 118 119 sav_eav = cx231xx_find_boundary_SAV_EAV(p_buffer, 120 dma_q->partial_buf, 121 &bytes_parsed); 122 } 123 124 sav_eav &= 0xF0; 125 /* Get the first line if we have some portion of an SAV/EAV from 126 the last buffer or a partial line */ 127 if (sav_eav) { 128 bytes_parsed += cx231xx_get_vbi_line(dev, dma_q, 129 sav_eav, /* SAV/EAV */ 130 p_buffer + bytes_parsed, /* p_buffer */ 131 buffer_size - bytes_parsed); /* buffer size */ 132 } 133 134 /* Now parse data that is completely in this buffer */ 135 dma_q->is_partial_line = 0; 136 137 while (bytes_parsed < buffer_size) { 138 u32 bytes_used = 0; 139 140 sav_eav = cx231xx_find_next_SAV_EAV( 141 p_buffer + bytes_parsed, /* p_buffer */ 142 buffer_size - bytes_parsed, /* buffer size */ 143 &bytes_used); /* bytes used to get SAV/EAV */ 144 145 bytes_parsed += bytes_used; 146 147 sav_eav &= 0xF0; 148 if (sav_eav && (bytes_parsed < buffer_size)) { 149 bytes_parsed += cx231xx_get_vbi_line(dev, 150 dma_q, sav_eav, /* SAV/EAV */ 151 p_buffer+bytes_parsed, /* p_buffer */ 152 buffer_size-bytes_parsed);/*buf size*/ 153 } 154 } 155 156 /* Save the last four bytes of the buffer so we can 157 check the buffer boundary condition next time */ 158 memcpy(dma_q->partial_buf, p_buffer + buffer_size - 4, 4); 159 bytes_parsed = 0; 160 } 161 162 return rc; 163 } 164 165 /* ------------------------------------------------------------------ 166 Vbi buf operations 167 ------------------------------------------------------------------*/ 168 169 static int 170 vbi_buffer_setup(struct videobuf_queue *vq, unsigned int *count, 171 unsigned int *size) 172 { 173 struct cx231xx_fh *fh = vq->priv_data; 174 struct cx231xx *dev = fh->dev; 175 u32 height = 0; 176 177 height = ((dev->norm & V4L2_STD_625_50) ? 178 PAL_VBI_LINES : NTSC_VBI_LINES); 179 180 *size = (dev->width * height * 2 * 2); 181 if (0 == *count) 182 *count = CX231XX_DEF_VBI_BUF; 183 184 if (*count < CX231XX_MIN_BUF) 185 *count = CX231XX_MIN_BUF; 186 187 return 0; 188 } 189 190 /* This is called *without* dev->slock held; please keep it that way */ 191 static void free_buffer(struct videobuf_queue *vq, struct cx231xx_buffer *buf) 192 { 193 struct cx231xx_fh *fh = vq->priv_data; 194 struct cx231xx *dev = fh->dev; 195 unsigned long flags = 0; 196 if (in_interrupt()) 197 BUG(); 198 199 /* We used to wait for the buffer to finish here, but this didn't work 200 because, as we were keeping the state as VIDEOBUF_QUEUED, 201 videobuf_queue_cancel marked it as finished for us. 202 (Also, it could wedge forever if the hardware was misconfigured.) 203 204 This should be safe; by the time we get here, the buffer isn't 205 queued anymore. If we ever start marking the buffers as 206 VIDEOBUF_ACTIVE, it won't be, though. 207 */ 208 spin_lock_irqsave(&dev->vbi_mode.slock, flags); 209 if (dev->vbi_mode.bulk_ctl.buf == buf) 210 dev->vbi_mode.bulk_ctl.buf = NULL; 211 spin_unlock_irqrestore(&dev->vbi_mode.slock, flags); 212 213 videobuf_vmalloc_free(&buf->vb); 214 buf->vb.state = VIDEOBUF_NEEDS_INIT; 215 } 216 217 static int 218 vbi_buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb, 219 enum v4l2_field field) 220 { 221 struct cx231xx_fh *fh = vq->priv_data; 222 struct cx231xx_buffer *buf = 223 container_of(vb, struct cx231xx_buffer, vb); 224 struct cx231xx *dev = fh->dev; 225 int rc = 0, urb_init = 0; 226 u32 height = 0; 227 228 height = ((dev->norm & V4L2_STD_625_50) ? 229 PAL_VBI_LINES : NTSC_VBI_LINES); 230 buf->vb.size = ((dev->width << 1) * height * 2); 231 232 if (0 != buf->vb.baddr && buf->vb.bsize < buf->vb.size) 233 return -EINVAL; 234 235 buf->vb.width = dev->width; 236 buf->vb.height = height; 237 buf->vb.field = field; 238 buf->vb.field = V4L2_FIELD_SEQ_TB; 239 240 if (VIDEOBUF_NEEDS_INIT == buf->vb.state) { 241 rc = videobuf_iolock(vq, &buf->vb, NULL); 242 if (rc < 0) 243 goto fail; 244 } 245 246 if (!dev->vbi_mode.bulk_ctl.num_bufs) 247 urb_init = 1; 248 249 if (urb_init) { 250 rc = cx231xx_init_vbi_isoc(dev, CX231XX_NUM_VBI_PACKETS, 251 CX231XX_NUM_VBI_BUFS, 252 dev->vbi_mode.alt_max_pkt_size[0], 253 cx231xx_isoc_vbi_copy); 254 if (rc < 0) 255 goto fail; 256 } 257 258 buf->vb.state = VIDEOBUF_PREPARED; 259 return 0; 260 261 fail: 262 free_buffer(vq, buf); 263 return rc; 264 } 265 266 static void 267 vbi_buffer_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb) 268 { 269 struct cx231xx_buffer *buf = 270 container_of(vb, struct cx231xx_buffer, vb); 271 struct cx231xx_fh *fh = vq->priv_data; 272 struct cx231xx *dev = fh->dev; 273 struct cx231xx_dmaqueue *vidq = &dev->vbi_mode.vidq; 274 275 buf->vb.state = VIDEOBUF_QUEUED; 276 list_add_tail(&buf->vb.queue, &vidq->active); 277 278 } 279 280 static void vbi_buffer_release(struct videobuf_queue *vq, 281 struct videobuf_buffer *vb) 282 { 283 struct cx231xx_buffer *buf = 284 container_of(vb, struct cx231xx_buffer, vb); 285 286 287 free_buffer(vq, buf); 288 } 289 290 struct videobuf_queue_ops cx231xx_vbi_qops = { 291 .buf_setup = vbi_buffer_setup, 292 .buf_prepare = vbi_buffer_prepare, 293 .buf_queue = vbi_buffer_queue, 294 .buf_release = vbi_buffer_release, 295 }; 296 297 /* ------------------------------------------------------------------ 298 URB control 299 ------------------------------------------------------------------*/ 300 301 /* 302 * IRQ callback, called by URB callback 303 */ 304 static void cx231xx_irq_vbi_callback(struct urb *urb) 305 { 306 struct cx231xx_dmaqueue *dma_q = urb->context; 307 struct cx231xx_video_mode *vmode = 308 container_of(dma_q, struct cx231xx_video_mode, vidq); 309 struct cx231xx *dev = container_of(vmode, struct cx231xx, vbi_mode); 310 311 switch (urb->status) { 312 case 0: /* success */ 313 case -ETIMEDOUT: /* NAK */ 314 break; 315 case -ECONNRESET: /* kill */ 316 case -ENOENT: 317 case -ESHUTDOWN: 318 return; 319 default: /* error */ 320 cx231xx_err(DRIVER_NAME "urb completition error %d.\n", 321 urb->status); 322 break; 323 } 324 325 /* Copy data from URB */ 326 spin_lock(&dev->vbi_mode.slock); 327 dev->vbi_mode.bulk_ctl.bulk_copy(dev, urb); 328 spin_unlock(&dev->vbi_mode.slock); 329 330 /* Reset status */ 331 urb->status = 0; 332 333 urb->status = usb_submit_urb(urb, GFP_ATOMIC); 334 if (urb->status) { 335 cx231xx_err(DRIVER_NAME "urb resubmit failed (error=%i)\n", 336 urb->status); 337 } 338 } 339 340 /* 341 * Stop and Deallocate URBs 342 */ 343 void cx231xx_uninit_vbi_isoc(struct cx231xx *dev) 344 { 345 struct urb *urb; 346 int i; 347 348 cx231xx_info(DRIVER_NAME "cx231xx: called cx231xx_uninit_vbi_isoc\n"); 349 350 dev->vbi_mode.bulk_ctl.nfields = -1; 351 for (i = 0; i < dev->vbi_mode.bulk_ctl.num_bufs; i++) { 352 urb = dev->vbi_mode.bulk_ctl.urb[i]; 353 if (urb) { 354 if (!irqs_disabled()) 355 usb_kill_urb(urb); 356 else 357 usb_unlink_urb(urb); 358 359 if (dev->vbi_mode.bulk_ctl.transfer_buffer[i]) { 360 361 kfree(dev->vbi_mode.bulk_ctl. 362 transfer_buffer[i]); 363 dev->vbi_mode.bulk_ctl.transfer_buffer[i] = 364 NULL; 365 } 366 usb_free_urb(urb); 367 dev->vbi_mode.bulk_ctl.urb[i] = NULL; 368 } 369 dev->vbi_mode.bulk_ctl.transfer_buffer[i] = NULL; 370 } 371 372 kfree(dev->vbi_mode.bulk_ctl.urb); 373 kfree(dev->vbi_mode.bulk_ctl.transfer_buffer); 374 375 dev->vbi_mode.bulk_ctl.urb = NULL; 376 dev->vbi_mode.bulk_ctl.transfer_buffer = NULL; 377 dev->vbi_mode.bulk_ctl.num_bufs = 0; 378 379 cx231xx_capture_start(dev, 0, Vbi); 380 } 381 EXPORT_SYMBOL_GPL(cx231xx_uninit_vbi_isoc); 382 383 /* 384 * Allocate URBs and start IRQ 385 */ 386 int cx231xx_init_vbi_isoc(struct cx231xx *dev, int max_packets, 387 int num_bufs, int max_pkt_size, 388 int (*bulk_copy) (struct cx231xx *dev, 389 struct urb *urb)) 390 { 391 struct cx231xx_dmaqueue *dma_q = &dev->vbi_mode.vidq; 392 int i; 393 int sb_size, pipe; 394 struct urb *urb; 395 int rc; 396 397 cx231xx_info(DRIVER_NAME "cx231xx: called cx231xx_prepare_isoc\n"); 398 399 /* De-allocates all pending stuff */ 400 cx231xx_uninit_vbi_isoc(dev); 401 402 /* clear if any halt */ 403 usb_clear_halt(dev->udev, 404 usb_rcvbulkpipe(dev->udev, 405 dev->vbi_mode.end_point_addr)); 406 407 dev->vbi_mode.bulk_ctl.bulk_copy = bulk_copy; 408 dev->vbi_mode.bulk_ctl.num_bufs = num_bufs; 409 dma_q->pos = 0; 410 dma_q->is_partial_line = 0; 411 dma_q->last_sav = 0; 412 dma_q->current_field = -1; 413 dma_q->bytes_left_in_line = dev->width << 1; 414 dma_q->lines_per_field = ((dev->norm & V4L2_STD_625_50) ? 415 PAL_VBI_LINES : NTSC_VBI_LINES); 416 dma_q->lines_completed = 0; 417 for (i = 0; i < 8; i++) 418 dma_q->partial_buf[i] = 0; 419 420 dev->vbi_mode.bulk_ctl.urb = kzalloc(sizeof(void *) * num_bufs, 421 GFP_KERNEL); 422 if (!dev->vbi_mode.bulk_ctl.urb) { 423 cx231xx_errdev("cannot alloc memory for usb buffers\n"); 424 return -ENOMEM; 425 } 426 427 dev->vbi_mode.bulk_ctl.transfer_buffer = 428 kzalloc(sizeof(void *) * num_bufs, GFP_KERNEL); 429 if (!dev->vbi_mode.bulk_ctl.transfer_buffer) { 430 cx231xx_errdev("cannot allocate memory for usbtransfer\n"); 431 kfree(dev->vbi_mode.bulk_ctl.urb); 432 return -ENOMEM; 433 } 434 435 dev->vbi_mode.bulk_ctl.max_pkt_size = max_pkt_size; 436 dev->vbi_mode.bulk_ctl.buf = NULL; 437 438 sb_size = max_packets * dev->vbi_mode.bulk_ctl.max_pkt_size; 439 440 /* allocate urbs and transfer buffers */ 441 for (i = 0; i < dev->vbi_mode.bulk_ctl.num_bufs; i++) { 442 443 urb = usb_alloc_urb(0, GFP_KERNEL); 444 if (!urb) { 445 cx231xx_err(DRIVER_NAME 446 ": cannot alloc bulk_ctl.urb %i\n", i); 447 cx231xx_uninit_vbi_isoc(dev); 448 return -ENOMEM; 449 } 450 dev->vbi_mode.bulk_ctl.urb[i] = urb; 451 urb->transfer_flags = 0; 452 453 dev->vbi_mode.bulk_ctl.transfer_buffer[i] = 454 kzalloc(sb_size, GFP_KERNEL); 455 if (!dev->vbi_mode.bulk_ctl.transfer_buffer[i]) { 456 cx231xx_err(DRIVER_NAME 457 ": unable to allocate %i bytes for transfer" 458 " buffer %i%s\n", sb_size, i, 459 in_interrupt() ? " while in int" : ""); 460 cx231xx_uninit_vbi_isoc(dev); 461 return -ENOMEM; 462 } 463 464 pipe = usb_rcvbulkpipe(dev->udev, dev->vbi_mode.end_point_addr); 465 usb_fill_bulk_urb(urb, dev->udev, pipe, 466 dev->vbi_mode.bulk_ctl.transfer_buffer[i], 467 sb_size, cx231xx_irq_vbi_callback, dma_q); 468 } 469 470 init_waitqueue_head(&dma_q->wq); 471 472 /* submit urbs and enables IRQ */ 473 for (i = 0; i < dev->vbi_mode.bulk_ctl.num_bufs; i++) { 474 rc = usb_submit_urb(dev->vbi_mode.bulk_ctl.urb[i], GFP_ATOMIC); 475 if (rc) { 476 cx231xx_err(DRIVER_NAME 477 ": submit of urb %i failed (error=%i)\n", i, 478 rc); 479 cx231xx_uninit_vbi_isoc(dev); 480 return rc; 481 } 482 } 483 484 cx231xx_capture_start(dev, 1, Vbi); 485 486 return 0; 487 } 488 EXPORT_SYMBOL_GPL(cx231xx_init_vbi_isoc); 489 490 u32 cx231xx_get_vbi_line(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q, 491 u8 sav_eav, u8 *p_buffer, u32 buffer_size) 492 { 493 u32 bytes_copied = 0; 494 int current_field = -1; 495 496 switch (sav_eav) { 497 498 case SAV_VBI_FIELD1: 499 current_field = 1; 500 break; 501 502 case SAV_VBI_FIELD2: 503 current_field = 2; 504 break; 505 default: 506 break; 507 } 508 509 if (current_field < 0) 510 return bytes_copied; 511 512 dma_q->last_sav = sav_eav; 513 514 bytes_copied = 515 cx231xx_copy_vbi_line(dev, dma_q, p_buffer, buffer_size, 516 current_field); 517 518 return bytes_copied; 519 } 520 521 /* 522 * Announces that a buffer were filled and request the next 523 */ 524 static inline void vbi_buffer_filled(struct cx231xx *dev, 525 struct cx231xx_dmaqueue *dma_q, 526 struct cx231xx_buffer *buf) 527 { 528 /* Advice that buffer was filled */ 529 /* cx231xx_info(DRIVER_NAME "[%p/%d] wakeup\n", buf, buf->vb.i); */ 530 531 buf->vb.state = VIDEOBUF_DONE; 532 buf->vb.field_count++; 533 do_gettimeofday(&buf->vb.ts); 534 535 dev->vbi_mode.bulk_ctl.buf = NULL; 536 537 list_del(&buf->vb.queue); 538 wake_up(&buf->vb.done); 539 } 540 541 u32 cx231xx_copy_vbi_line(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q, 542 u8 *p_line, u32 length, int field_number) 543 { 544 u32 bytes_to_copy; 545 struct cx231xx_buffer *buf; 546 u32 _line_size = dev->width * 2; 547 548 if (dma_q->current_field == -1) { 549 /* Just starting up */ 550 cx231xx_reset_vbi_buffer(dev, dma_q); 551 } 552 553 if (dma_q->current_field != field_number) 554 dma_q->lines_completed = 0; 555 556 /* get the buffer pointer */ 557 buf = dev->vbi_mode.bulk_ctl.buf; 558 559 /* Remember the field number for next time */ 560 dma_q->current_field = field_number; 561 562 bytes_to_copy = dma_q->bytes_left_in_line; 563 if (bytes_to_copy > length) 564 bytes_to_copy = length; 565 566 if (dma_q->lines_completed >= dma_q->lines_per_field) { 567 dma_q->bytes_left_in_line -= bytes_to_copy; 568 dma_q->is_partial_line = 569 (dma_q->bytes_left_in_line == 0) ? 0 : 1; 570 return 0; 571 } 572 573 dma_q->is_partial_line = 1; 574 575 /* If we don't have a buffer, just return the number of bytes we would 576 have copied if we had a buffer. */ 577 if (!buf) { 578 dma_q->bytes_left_in_line -= bytes_to_copy; 579 dma_q->is_partial_line = 580 (dma_q->bytes_left_in_line == 0) ? 0 : 1; 581 return bytes_to_copy; 582 } 583 584 /* copy the data to video buffer */ 585 cx231xx_do_vbi_copy(dev, dma_q, p_line, bytes_to_copy); 586 587 dma_q->pos += bytes_to_copy; 588 dma_q->bytes_left_in_line -= bytes_to_copy; 589 590 if (dma_q->bytes_left_in_line == 0) { 591 592 dma_q->bytes_left_in_line = _line_size; 593 dma_q->lines_completed++; 594 dma_q->is_partial_line = 0; 595 596 if (cx231xx_is_vbi_buffer_done(dev, dma_q) && buf) { 597 598 vbi_buffer_filled(dev, dma_q, buf); 599 600 dma_q->pos = 0; 601 dma_q->lines_completed = 0; 602 cx231xx_reset_vbi_buffer(dev, dma_q); 603 } 604 } 605 606 return bytes_to_copy; 607 } 608 609 /* 610 * video-buf generic routine to get the next available buffer 611 */ 612 static inline void get_next_vbi_buf(struct cx231xx_dmaqueue *dma_q, 613 struct cx231xx_buffer **buf) 614 { 615 struct cx231xx_video_mode *vmode = 616 container_of(dma_q, struct cx231xx_video_mode, vidq); 617 struct cx231xx *dev = container_of(vmode, struct cx231xx, vbi_mode); 618 char *outp; 619 620 if (list_empty(&dma_q->active)) { 621 cx231xx_err(DRIVER_NAME ": No active queue to serve\n"); 622 dev->vbi_mode.bulk_ctl.buf = NULL; 623 *buf = NULL; 624 return; 625 } 626 627 /* Get the next buffer */ 628 *buf = list_entry(dma_q->active.next, struct cx231xx_buffer, vb.queue); 629 630 /* Cleans up buffer - Useful for testing for frame/URB loss */ 631 outp = videobuf_to_vmalloc(&(*buf)->vb); 632 memset(outp, 0, (*buf)->vb.size); 633 634 dev->vbi_mode.bulk_ctl.buf = *buf; 635 636 return; 637 } 638 639 void cx231xx_reset_vbi_buffer(struct cx231xx *dev, 640 struct cx231xx_dmaqueue *dma_q) 641 { 642 struct cx231xx_buffer *buf; 643 644 buf = dev->vbi_mode.bulk_ctl.buf; 645 646 if (buf == NULL) { 647 /* first try to get the buffer */ 648 get_next_vbi_buf(dma_q, &buf); 649 650 dma_q->pos = 0; 651 dma_q->current_field = -1; 652 } 653 654 dma_q->bytes_left_in_line = dev->width << 1; 655 dma_q->lines_completed = 0; 656 } 657 658 int cx231xx_do_vbi_copy(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q, 659 u8 *p_buffer, u32 bytes_to_copy) 660 { 661 u8 *p_out_buffer = NULL; 662 u32 current_line_bytes_copied = 0; 663 struct cx231xx_buffer *buf; 664 u32 _line_size = dev->width << 1; 665 void *startwrite; 666 int offset, lencopy; 667 668 buf = dev->vbi_mode.bulk_ctl.buf; 669 670 if (buf == NULL) 671 return -EINVAL; 672 673 p_out_buffer = videobuf_to_vmalloc(&buf->vb); 674 675 if (dma_q->bytes_left_in_line != _line_size) { 676 current_line_bytes_copied = 677 _line_size - dma_q->bytes_left_in_line; 678 } 679 680 offset = (dma_q->lines_completed * _line_size) + 681 current_line_bytes_copied; 682 683 if (dma_q->current_field == 2) { 684 /* Populate the second half of the frame */ 685 offset += (dev->width * 2 * dma_q->lines_per_field); 686 } 687 688 /* prepare destination address */ 689 startwrite = p_out_buffer + offset; 690 691 lencopy = dma_q->bytes_left_in_line > bytes_to_copy ? 692 bytes_to_copy : dma_q->bytes_left_in_line; 693 694 memcpy(startwrite, p_buffer, lencopy); 695 696 return 0; 697 } 698 699 u8 cx231xx_is_vbi_buffer_done(struct cx231xx *dev, 700 struct cx231xx_dmaqueue *dma_q) 701 { 702 u32 height = 0; 703 704 height = ((dev->norm & V4L2_STD_625_50) ? 705 PAL_VBI_LINES : NTSC_VBI_LINES); 706 if (dma_q->lines_completed == height && dma_q->current_field == 2) 707 return 1; 708 else 709 return 0; 710 } 711